Well eventually but as of now we won't be getting anything beyond Rogue/Thief due to their plan to release the other new classes and Jobs on the 1st expansion and beyond.
However, due to the Gunblade being part of FF14 world it shouldn't be a surprise a Gunblade class/jobs is made but only question is what will a Gunblade class be called and what the names of its Jobs will be called since Gunblades hasn't obtained a name for their class/job in the FF games yet.
(Yoshi-P did mentioned that the Gun class/Job will not be what people expect it to be once it is released. It would be interesting if the Gun class turns out to be the Gunblade class. After all there is two types of Gunblades in this game now being the Long sword Gunblade (often used by Garleans and designed for melee combat more) and the Pistol designed Gunblade( which Cid uses as his main weapon designed more for long range combat like a normal Musket pistol))
